KR20140041857A - Composite assembly for a motor vehicle - Google Patents

Abstract

The present invention relates to an automobile composite assembly (1) comprising at least one electroacoustic transducer (2) for transmitting sound waves, and at least one wall member (4), wherein the transducer (2) is inside the wall member (4). ) Is concealed and an intermediate member 3 is disposed between the transducer 2 and the wall member 4 to influence the acoustic emission behavior, and the intermediate member 3 is directed toward the wall member 4 while the sound wave It includes a contact surface 30 for transmitting. According to the invention, it is proposed that at least one recess 31 is formed inside the contact surface 30 in which the intermediate member 3 is not contacted on the wall member 4. In this way it is possible to have a very flexible and demand-oriented influence on the emission characteristics of an electroacoustic transducer.

Description

Automotive Composite Assembly {COMPOSITE ASSEMBLY FOR A MOTOR VEHICLE}

The present invention relates to a composite assembly for automobiles according to the preamble of claim 1.

For reasons of design technology, it is becoming increasingly widespread to mount concealed electroacoustic transducers (hereinafter referred to as distance sensors as examples) inside the structural members of the motor vehicle (e.g. bumper linings).

Although this has the advantage that the design of the motor vehicle in the area of assembled distance sensors is not degraded by visible distance sensors from the outside as in other cases, it also brings certain functional disadvantages.

That is, the distance sensor has to transmit and receive the ultrasonic wave through the wall member of the vehicle under the concealed assembly condition, thereby reducing the propagation efficiency of the ultrasonic wave on the one hand and the sensitivity or sensitivity of the distance sensor on the other hand. .

In this case, the emission behavior of the concealed assembled distance sensors is in principle separated into two cases.

On the one hand, "direct" acoustic emission is initiated at right angles to the surface of the wall member, and on the other hand, "indirect" acoustic emission is initiated under an angle of approximately 45 degrees due to the surface waves generated on the wall member.

This results in an emission characteristic in which the apparent deterioration area of the sound pressure level is recorded in the range of the emission angle of about ± 22 degrees as a whole.

The "partial dead zone" should always ensure that the dead zone is met by neighboring distance sensors in the application of the distance sensors.

From DE 10 2006 034 997 A1 a composite assembly for automobiles is known which comprises the features of the preamble of claim 1. In this case, an intermediate member is used which can be formed in the form of a plate and in the top view a rectangle. In addition, it is also proposed to form the intermediate member into a truncated cone shape. Therefore, it is said that through the intermediate member, the direction and sensitivity of the electroacoustic transducer are preferably affected.

It is an object of the present invention to provide an alternative possibility for the composite assembly which can have a very flexible effect on the acoustic emission behavior of the assembled distance sensor or its sensitivity in an automobile composite assembly.

This problem is solved by the features of patent claim 1. Preferred improvements are presented in the dependent claims.

Therefore, the present invention is based on a composite assembly for automobiles comprising one or more electroacoustic transducers for transmitting sound waves and one or more wall members of an automobile, wherein the transducers are concealed and assembled inside the wall members, the transducers and wall members Intermediate members are disposed in between to effect the acoustic emission behavior, which includes a contact surface for transmitting sound waves while facing the wall member.

According to the invention, inside the contact surface, one or more recesses are formed in which no contact of the intermediate member is made on the wall member.

Contact here means not only direct contact between the contact surface and the wall member but also indirect contact between which the adhesive layer is constituted.

By means of the configuration according to the invention of the intermediate member, it is possible to form sound waves introduced into the wall member by the distance sensor such that a desired emission characteristic is produced. In particular, it is possible to "smoothe" the emission characteristics, ie to provide the emission characteristics without a noticeable degradation area of the sound pressure level in the aforementioned angle range of about ± 22 degrees.

In this case, according to an improvement of the present invention, the contact surface includes a plurality of recesses. In this case, the recesses may be rectangular, for example. By the recesses, the contact zone formed by the intermediate member is removed or disconnected several times, thereby further increasing the flexibility with respect to the generation of the desired release properties.

However, it is also conceivable to form one or more regions inside the recess in an alternative manner, in which contact of the intermediate member is again made on the wall member. In this case, the area may be circular or rectangular. In the case where a plurality of areas of the above type are formed inside the recess, a mixture of cross-sectional shapes can be considered. Thus, the plurality of regions can be formed, for example, circular and / or rectangular. Other cross-sectional shapes can also be considered.

For vertical focusing of the acoustic emission angle, it has proven to be desirable when the contact surface and the recessed portion are rectangular in relation to its contour. In this case, in the assembled state of the composite assembly, the longitudinal sides of the aforementioned contours are oriented approximately horizontally.

Vertical focusing of the acoustic emission angle is particularly desirable in distance sensors used as park distance control. In this way, unintended detection of the road surface can be clearly reduced.

In order to improve the decay behavior of the composite assembly consisting of the electroacoustic transducer, the intermediate member and the wall member, in addition, an acoustically absorbing mass, such as a foam, is further inserted into the recesses or recesses of the intermediate member. Etc. can be inserted.

In addition, in the experiment, if the intermediate member is at least partially surrounded by a damping element, the damping member is likewise seated on the wall member (eg adhered to the wall member) and spaced at a predetermined interval relative to the intermediate member. It has been found that the dispersion of the surface waves generated by the distance sensor on the wall member can be effectively limited.

The intended effect can be further improved by placing the damping member around the intermediate member in the form of a frame.

Further advantages and configurations of the present invention are clearly identified according to the embodiments, which are explained in more detail by the accompanying drawings.

According to the present invention, in the automobile composite assembly, there is provided an alternative possibility to the composite assembly which can have a very flexible effect on the acoustic emission behavior of the assembled distance sensor or its sensitivity.

1 is a basic perspective view of a composite assembly (preferred embodiment) according to the present invention.
FIG. 2 is a cross-sectional view (long sectional view) of the composite assembly of FIG. 1 along cut line II. FIG.
Figure 3 is a basic perspective view of the composite assembly according to the invention shown looking at the contact surface of the intermediate member in the state that the wall member of the vehicle is excluded.
FIG. 4 is a basic view of the second embodiment, in which only the contact surface of the intermediate member is shown.
FIG. 5 is a basic view of the third embodiment shown in accordance with the same view as FIG. 4.
FIG. 6 is a basic view of the fourth embodiment likewise shown in the same view as in FIG. 4.
7 are graphs showing the acoustic emission characteristics of the concealed assembled distance sensor with or without the measures according to the invention, respectively.
8 is a vehicle equipped with a composite assembly according to the present invention.

First, the description will be given with reference to FIGS. 1 to 3.

1 to 3 show a composite assembly 1 comprising a distance sensor 2 concealed inside a wall member 4 of a motor vehicle in the form of a bumper lining. Therefore, the distance sensor 2 is inconspicuous when the vehicle is viewed from the outside. The distance sensor may generate and receive vibrations in a manner not shown.

Between the distance sensor 2 and the wall member 4 an intermediate member 3 in the form of a block is provided, through which the distance sensor 2 is gripped on the wall member 4. In this case, the intermediate member 3 can be seated on the wall member 4 with a contact surface 30 and adhered to, for example, the wall member. However, other methods of fixing may also be considered, for example ultrasonic welding or friction welding.

Moreover, it can also be confirmed that the recessed part 31 in which the contact surface for the wall member 4 is not provided inside the contact surface 30 is provided. Thus, in the region of the recess 31, the intermediate member 3 may not be seated on the wall member 4 directly or indirectly (eg via an adhesive layer).

The contact surface 30 and the recess 31 are each formed in a rectangle with respect to its contour (see especially FIG. 3).

In addition, in the figure it can be seen that the damping member 5 is arranged around the intermediate member 3 in the form of a frame. In this case, the damping member is likewise formed in a rectangular shape with respect to its contour and is spaced apart by an interval a around the intermediate member 3. The damping member 5 itself is seated on the wall member 4 at the contact surface 50 and can be bonded like the wall member. However, the damping member 5 does not necessarily have to be arranged around the intermediate member 3 in the form of a frame. For example, it is conceivable that the end member 52 is cut off, for example, at the cut surfaces 51, if the geometric ratio does not require a local increase in strength in the corresponding area.

Similarly, for example, the configuration of the breaks 53 (dashed lines) can be considered.

On the other hand, in FIGS. 4 to 6, further embodiments of intermediate members 6, 7 and 8 which include corresponding functions such as the intermediate member 3 described above can be seen. The intermediate members are substantially distinguished from one another in the construction of their contact surface, for example, which can seat the intermediate members on the wall member as described above.

Accordingly, the intermediate member 6 has a contact surface 60, and a plurality of recesses 61 are formed inside the contact surface. Not only the contact surface 60 but also the recesses 61 are formed in a rectangle with respect to the contour thereof.

The intermediate member 7 includes a contact surface 70, and one recessed portion 71 is formed inside the contact surface. Inside the recessed portion 71, a plurality of regions 72 are provided which can form region-specific contact surfaces with respect to the wall member. The contact surface 70, recess 71 and regions 72 are each formed in a rectangle with respect to its contour.

Finally, the intermediate member 8 represents an embodiment including a contact surface 80 in which, unlike the intermediate member 7, the regions 82 formed inside the recess 81 are formed in a circular shape. . Thus, not only the contact surface 80 but also the regions 82 form possible contacts for the wall member. The regions 82 are formed in a circular shape, in the extreme case even in the form of dots, so that highly decentralized transmission of the generated sound waves can be achieved inside the recesses 81, which is suitable for the parking process depending on the situation. It may not be required for distance sensors that are not used.

In the illustrated embodiments, in order to improve the damping behavior of the composite assembly 1 consisting of the electroacoustic transducer 2, the intermediate members 3, 6, 7 or 8 and the wall member 4, Sound absorbing masses, such as foams, etc., may further be inserted into the recesses 31, 61, 71 and 81, respectively (not shown).

Finally, according to FIG. 7, the sound pressure level curve P of the concealed assembled distance sensor is shown as an example.

The sound pressure level curve P thus shows the maximum value P5 (direct release, perpendicular to the surface of the wall member) of the sound pressure, typically in the emission angle range of about 0 degrees without the construction according to the invention of the composite assembly. On both sides next to the maximum value P5, ie in the angle range of the emission angle of about 45 degrees each, additional local maximum values P3 and P4 (indirect emissions generated by surface waves) are recorded. Degradation regions P1 and P2 at the sound pressure level are formed at an emission angle of about 22 degrees between the sound pressure levels P5 and P3 and between the sound pressure levels P5 and P4, respectively.

Through the configuration according to the invention of the composite assembly, the degradation regions P1 and P2 are raised upwards (P1 'and P2'), thereby producing a sound pressure level curve which is smoothed entirely.

Finally, FIG. 8 shows a motor vehicle 9 comprising a plurality of composite assemblies 1 according to the invention in the region of the front bumper lining 4. The composite assemblies may be provided in different positions of the motor vehicle, for example in the door area, the door sill area or the roof area, depending on the respective demand (not shown).

1: composite assembly
2: distance sensor
3: intermediate member
30: contact surface
31: recess
4: wall member (bumper lining)
5: damping member of frame type
50: contact surface
51: cutting plane
52: cut end member
53: break
6: middle member
60: contact surface
61: recess
7: middle member
70: contact surface
71: recess
72: contact area for the wall member
8: middle member
80: contact surface
81: recess
82: contact area for wall members
9: car
a: spacing of the damping member of the frame type from the intermediate member
P: sound pressure level curve
P1: declining area of sound pressure level at an emission angle of about -22 °
P1 ': Smooth sound pressure level at emission angle of about -22 °
P2: Reduction zone of sound pressure level at an emission angle of about + 22 °
P2 ': Smooth sound pressure level at emission angle of about + 22 °
P3: Local sound pressure level peak at an emission angle of about -45 °
P4: Local sound pressure level peak at an emission angle of about + 45 °
P5: Sound pressure level maximum at an emission angle of about 0 °

Claims (8)

A composite assembly (1) for a motor vehicle (9) comprising at least one electroacoustic transducer (2) for transmitting sound waves and at least one wall member (4) of the motor vehicle (9), wherein the interior of the wall member (4) is electric The acoustic transducer 2 is concealed and an intermediate member 3, 6, 7, 8 is disposed between the electroacoustic transducer 2 and the wall member 4, which acts on the acoustic emission behavior P. In the composite assembly, wherein the members 3, 6, 7, 8 comprise contact surfaces 30, 60, 70, 80 for transmitting sound waves while facing the wall member 4,
Inside the contact surfaces 30, 60, 70, 80, one or more recesses 31, 61, which are not in contact with the intermediate members 3, 6, 7, 8 on the wall member 4. 71, 81) is formed. 2. A composite assembly according to claim 1, wherein the contact surface (60) comprises a plurality of recesses (61). The one or more regions (72, 82) according to claim 1, wherein the recesses (71, 81) are formed in contact with the wall member (4) and the intermediate members (7, 8) internally. Composite assembly characterized in that. 4. A composite assembly according to claim 3, wherein the one or more regions are circular (82) or rectangular (72). 5. The contact surface (30, 60, 70, 80) and the recesses (31, 61, 71, 81) according to any one of claims 1 to 4, characterized in that the contour is rectangular. Composite assembly. 6. The intermediate member (3) according to any one of the preceding claims, wherein the intermediate member (3) is surrounded by damping members (5) at least on a per region basis, and the damping members (5) are seated on the wall members (4). And spaced at a predetermined distance (a) from the intermediate member (3). 7. Composite assembly according to claim 6, characterized in that the damping member (5) is arranged around the intermediate member (3) in the form of a frame. 8. A composite assembly according to any one of claims 1 to 7, wherein an acoustic absorbing mass part is inserted into the recessed part (31, 61, 71, 81).

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